National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

72°F

22°C

Humidity 19%
Wind Speed S 6 mph
Barometer 30.16 in (1020.9 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Last update 7 Feb 6:56 pm CST
Extended Forecast for

4 Miles SW San Marcos TX

  • Tonight

    Tonight: Partly cloudy, with a low around 49. South southeast wind around 5 mph becoming southwest after midnight.

    Low: 49 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 77. South southwest wind 5 to 10 mph.

    High: 77 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 54. South wind around 5 mph.

    Low: 54 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 78. South wind 5 to 10 mph.

    High: 78 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 59. South southeast wind 5 to 10 mph.

    Low: 59 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of showers, mainly after noon. Cloudy, with a high near 73. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 73 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers before midnight. Mostly cloudy, with a low around 57. South wind around 5 mph.

    Low: 57 °F

    Chance
    Showers then
    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 83. Southwest wind around 5 mph.

    High: 83 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 57. South wind around 5 mph.

    Low: 57 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 49. South southeast wind around 5 mph becoming southwest after midnight.
Sunday
Partly sunny, with a high near 77. South southwest wind 5 to 10 mph.
Sunday Night
Partly cloudy, with a low around 54. South wind around 5 mph.
Monday
Partly sunny, with a high near 78. South wind 5 to 10 mph.
Monday Night
Mostly cloudy, with a low around 59. South southeast wind 5 to 10 mph.
Tuesday
A 40 percent chance of showers, mainly after noon. Cloudy, with a high near 73. South wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
A 30 percent chance of showers before midnight. Mostly cloudy, with a low around 57. South wind around 5 mph.
Wednesday
Mostly sunny, with a high near 83. Southwest wind around 5 mph.
Wednesday Night
Mostly clear, with a low around 57. South wind around 5 mph.
Thursday
Mostly sunny, with a high near 84.
Thursday Night
Partly cloudy, with a low around 58.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 79.
Friday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 53.
Saturday
A 20 percent chance of showers. Partly sunny, with a high near 72.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW San Marcos TX
 29.86°N 97.99°W (Elev. 748 ft)
Last Update:
5:44 pm CST Feb 7, 2026
Forecast Valid:
7pm CST Feb 7, 2026-6pm CST Feb 14, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation